Genomic constitution of the allo-octoploid Elymus tenuis (Poaceae: Triticeae) of New Zealand

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doi:10.1071/SB10014

Genomic constitution of the allo-octoploid Elymus tenuis (Poaceae: Triticeae) of New Zealand

Hai-Qin Zhang ^A ^B, Xue Bai ^A ^B, Bao-Rong Lu ^C, Henry E. Connor ^D ^E, Yong-Hong Zhou ^A ^B ^E

^A Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China.
^B Key Laboratory of Crop Genetic Resources and Improvement, Ministry of Education, Sichuan Agricultural University, Yaan 625014, Sichuan, China.
^C The Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai 200433, China.
^D Department of Geography, University of Canterbury, Private Bag 4800, Christchurch, New Zealand.
^E Corresponding authors. Email for Y.-H. Zhou: zhouyh@sicau.edu.cn





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Australian Systematic Botany 23(5) 381–385 http://dx.doi.org/10.1071/SB10014
Submitted: 29 March 2010 Accepted: 28 July 2010 Published online: 3 November 2010

Abstract

Elymus tenuis (Buch.) Á.Löve et Connor is a perennial octoploid (2n = 56) wheatgrass endemic to New Zealand. To investigate its genomic constitution, four artificial interspecific hybrids between E. tenuis and E. enysii (2n = 4x = 28, HW), and E. solandri (2n = 6x = 42, StYW) and E. multiflorus (2n = 6x = 42, StYW) were studied cytologically. Meioses in pollen mother cells (PMCs) of the hybrids showed relatively high chromosome pairing, with an average of 13.50 in E. enysii × E. tenuis, 20.22 in E. solandri × E. tenuis, 19.62 in E. multiflorus × E. tenuis, and 20.00 in E. tenuis × E. multiflorus bivalents per cell, respectively. The results indicate that E. tenuis is an allo-octoploid species, with the new and unique genomic constitution StYHW. An autochthonous origin is proposed for it.